Limekiln



W. JONES.

(No Model.)

LIMEKILN.

No. 437,494. `Patented Sept. 30, 1890.

nV///////////////////////////- w A ///////x// ////////n/ w? UNITEDSTATES PATENT OFFICE. l

WILLIAM JONES, OF SAN FRANCISCO, CALIFORNIA.

LIMEKILN.

SPECIFICATION forming part Of Letters Patent NO.l 437,494, datedSeptember 30, 1890.

Application filed March 7, 1890. Serial No. 343,029. (No model.)

be a full, clear, and eXact descriptionof the- Y Same.

My invention relates to that class of furnaces especially adapted forthe burning of Portlandy cement clinker or other substances requiring ahigh degree of heat.

My invention consists in the novel constructions, arrangements, andcombinations hereinafter fully set forth, and specifically pointed outin the claims.

The object of my invention is to provide a furnace for this purpose of asimple construction and eective in operation.

Referring to the accompanying drawings for a more complete explanationof my invention, Figure 1 is a vertical section of my furnace. Fig. 2 isa horizontal section through the lire-chambers. Fig. 3 is a horizontalsection through the rotary cylinder.

Ais the chimney.

B is an inclined revolving cylinder, one end of which is incommunication with the chimney, said cylinder being mounted uponsuitable anti-friction rollers, designated by b, and is driven by a gearmechanism b.

C is a chute extending into and across the chimney and communicatingwith the upper end of the revolving cylinder.

D is the vertical furnace-shaft, the upper end of which is incommunication with the lower end of the revolving cylinder.

E is an inner vertical tube within the furnace-shaft. The upper end ofthis tube is open, and is in such position as to receive the materialfrom the lower end of t-he revolving cylinder.

F are the fire-chambers of the furnace, and into and through these theinner tubeE passes, its lower end being open and communicating with adirecting-plate G, by which the cars H are loaded. The inner tube E,within the fire-chambers, may or may not be perforated, as shown at e.Said tube E is made of any suitable suciently-refractory material, andis open from end to end, so that the material being burned passescompletely through it.

The openings e Within the fire-chambers are for the purpose of passinginto the inner tube a part of the ame and draft.

The operation of the furnace is as follows: The material to be burned isformed by pugmill and molding-machine or crushers into small pieces orballs, which are fed in through the chute C into the revolving cylinderB. In this cylinder they are moved gradually for-` ward on account ofthe slope or inclination of the cylinder and its rotation, and inpassing through it are dried and heated, the heat graduallyincreasing-to the lower end lof. the' cylinder. The heat is so regulatedthat the material is upon the point of clinkering when it reaches theoutlet end of the cylinder; thence it falls into the vertical tube E,which is kept at the white heat necessary to perfect the burningor'clinkering and out at the bottom of said tube, and by the plate G isdi rected into the receiving-cars.

I do not confine myself to the use of a single revolving cylinder, as asecond one may be connected with the rst for thepurpose of moregradually heating the material.

As the slightly-varying percentages of carbonate of lime, iron, oralkalies in various Portland cement slurres aect somewhat thetemperature at which they will clinker and the time they require to beexposed to the necessary white heat, the length ofthe furA naceshaft andthe inner tube will vary for dilerent materials. The balls or fragmentsof raw material will also vary from the size of peas to a larger size,according to the particular slurry being burned; but the shaft andthe-tube must be of sufficient length, and the draft must be soregulated as to give the necessary White heat and also to keep the smallballs within the tube a sufficient time for thorough clinkering. Theinner tube E is necessary, both by' reason of the fact that it must bekept at a white heat, which would not be so well had in the furnaceshaftalone, and also because the draft through the furnace-shaft is so greatas to render impractical any attempt to drop the fragments or balls ofmaterial directly through the shaft, but, being dropped through thetube, they are thoroughly clinkered and do not meet with the resistanceof a great draft.

Having thus described my invention,what

IOO

I claim as new, and desire to secure by Letters Patent, is-

l. In a furnace for burning Portland cenient clinker and othersubstances requiring a high temperature, the fire-chambers having thevertical shaft, and the open-ended tube within said shaft and throughwhich the material to be burned is dropped, substantially them, thevertical open-ended tube within said shaft passing through thefire-chambers and opening below, and the revolving cylindercommunicating with the top of the shaft and adapted to discharge thematerial into the upper end of the tube within the shaft, substantiallyas herein described.

4. A furnace for burning Portland cement clinker and other substancesrequiring a high temperature, consisting of the combination offire-chambers having a vertical shaft, the open-ended tube Within saidshaft and passing through the rc-chambers, said tube having openings inits sides Within the tire-chambers, the revolving cylinder communicatingwith the top of the shaft and adapted to discharge its material into theopen upper end of the tube within the shaft, the chimney at the end ofthe revolving cylinder, andV the feed-chute for directing the materialinto said cylinder, substantially as hereindescribed.

hand.

Witnesses:

S. H. NoURsE, H. C. LEE.

In witness whereof I have hereunto set my

